by Drs. H. Malayu S.P. Hasibuan $7.00
by Azimah Soebagijo $8.00
by Prof. J. Suprapto, M.A. APU $16.00
by Agus Setiawan $12.00
by Edilius, S.E., dkk $7.00
by Drs. Husein Umar, S.E., M.M., MBA $7.00